Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

David A Toivonen, M.D.

Orthopaedic Surgery Physician in Appleton, WI · enumerated 2006.

Data current as of Jul 11, 2026 · sourced from CMS NPPES

National Provider Identifier

1821055229

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Registry record

Entity type Individual (Type 1)

Name David A Toivonen

Credential M.D.

Sex Male

Practice address 2323 N Casaloma Dr, Appleton, WI, 54913

Phone (920) 730-8833

Enumeration date Apr 28, 2006

Last updated in NPPES Oct 31, 2012

Taxonomy & licenses

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License 31403 (WI) Primary

MD — Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
0555860001	Other	WI	NATIONAL GOVERNMENT SERVI
32174800	Medicaid	WI	—

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1821055229 active?

Yes — as of the latest NPPES snapshot, NPI 1821055229 is active (record last updated 2012-10-31).

How do I verify David Toivonen's NPI record?

Cross-check NPI 1821055229 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2012-10-31.